2 Wire Smoke Detector Wiring Diagram | Free Wiring DiagramAssortment of 2 wire smoke detector wiring diagram. A wiring diagram is a simplified traditional photographic depiction of an electrical circuit. It reveals the parts of the circuit as streamlined forms, and also the power as well as signal links between the devices.Connecting 2 Wire Smoke Detectors - Home Security SystemsConnecting 2 Wire Smoke Detectors. Follow the specific fire alarm schematic supplied by the smoke detector manufacturer to make connections. A smoke detector wiring diagram is normally included with every detector, and will show you how to correctly hook up the device.